diff --git a/common/core/desktop/tests/unit/kmnkbd/test_kmx_xstring.cpp b/common/core/desktop/tests/unit/kmnkbd/test_kmx_xstring.cpp
index a0874887c4..84a223ebf7 100644
--- a/common/core/desktop/tests/unit/kmnkbd/test_kmx_xstring.cpp
+++ b/common/core/desktop/tests/unit/kmnkbd/test_kmx_xstring.cpp
@@ -237,7 +237,7 @@ int main(int argc, char *argv []) {
    return error_args();
  }
 
-  auto arg_color = std::string(argv[1]) == "--color";
+  auto arg_color = argc > 1 && std::string(argv[1]) == "--color";
   if(arg_color && argc < 3) {
     return error_args();
   }